Rivet manufacture



Patented Aug. 23, 1921.

PATENT OFFICE.

HENRY o. nmcncmrr, or BROOKLYN, NEW YORK.

RIVET MANUFACTURE Specification of Letters ratent.

Patented Aug. 23, 1921.

Application filed May 3, 1920. Serial No. 378,464.

To all whom it may concern:

Be it known that I, HENRY C. HINCHCLIFF, a citizen of the United States, and a resident of the borough of Brooklyn, county of Kings, and State of New York, have in vented new and useful Improvements in Rivet-Manufacture, of which the following is a specification.

The object of this invention is to provide means in a rivet heading machine for making tubular and pronged rivets which have heretofore been respectively drilled and sawed after leaving the heading machine.

This invention relates to that class of machines in which a reciprocating hammer or press is employed to head rivets and in which one or more dies are carried by the hammer to form the head of the rivet by giving one or more blows with each die and particularly to that class of machines in which an ejector is employed to remove the rivet from the dies after it is finished and will be shown and described herein as adapted to a machine having two dies carried by the hammer, such being generally used for making this class of rivets.

My present invention relates to the manufacture of rivets and consists of an improved method of manufacture which comprehends an improved initial distribution or disposition of metal whereby the final steps or operations to complete the rivets may be performed more successfully and with greater facility and uniformity as a result thereof. My invention further consists of improved means adapted to form the rivets in accordance with my improved method and to secure the advantages thereof.

In accordance with my improved method of manufacture, the rivet blank is formed in the initial operation of heading to produce a body wherein the metal is distributed i proportion to the final disposition, whereby the extrusion of the metal may be effected without excessive or undue distortion and movement of the metal thereof.

Furthermore in accordance with my invention the metal to be extruded is reduced in cross sectional area with relation to the body of the rivet whereby the latter offers greater resistance to distortion or displacement and i consequence will properly suption thus further insuring against its distortion.

Important features of my improvements consist in forming the blank receiving die with a portion of a cross area adapted to hold enough metal only to form the tube or prongs of a rivet and which may later be extruded to the, size of the rivet body by a punch or ejector' being forced therein to.

Gther improvements consist in an ejector adapted to p1erce the rivet body longitudinally In means for adjusting the lateral position of an ejector located within the blank receiving die thereby regulating the length of the portion adapted to receive metal for the tube or prongs of a rivet.

Means for compressing a rivet body longitudinally between an ejector and a heading die after the head is formed and means for regulating the said compression.

. It belng understood that the said adjusting and regulating means are arranged to act while the machine is in operation.

A peculiar advantage of these improvements resides in indenting the end of a relatively reduced portion of a rivet body when formed in the initial operation of heading, so that later a punch is thereby centrally piloted to pierce and extrude the reduced portion and to thus form a tube concentric with the body.

. The described and other features of my invention are illustrated in the accompanying drawings wherein like reference charac' ters are applied to the corresponding parts in the several views-- Figure 1 is a sectional view of an anvil 1, a holding or blank receiving and body forming die 2, an ejector 3, and showing a rivet 4, after the end has been reduced at 2 and a head formed by a blow of a heading die.

Fig. 2 is a sectional view of a reciprocating hammer 5, a die carrier 6, a centering die 7, and a finishing die 8.

Fig. 3 is a sectional view of the anvil, the holding die, the ejector, the hammer and die carrier and the centering and finishing dies, the rivet is here shown after the head has been formed b the finishing die and compressed longitu inally between the ejector and the finishing die.

6 Fi 4 is, a sectional view of the anvil, the holding die, the e'ector, with a finished rivet pushed from the oldin die and a stripper 9, moved under the hea of the rlvet.

Fig. 5 is a plan view of the same. 10, Fig. 6 is a plan and side view partly in Fig. 7 is a view in perspective of an ejector adapted to form a four'prong rivet Figs. 8 and,9 are plan and side views partly in section of tubular rivets.

Inthis process of rivet makmg a rod of metal of the size of the rivet body is fed into the machine and a piece long enough to form a rivet is sheared therefrom-then fed to and formed into shape by the dies and then ejected therefrom which completes the process.

To insure the forming of true heads, one of the hammer dies is socket shapedThis recedes the finishing die and holds the dy of the rivet in line w-hlle bemg shouldered and a head formed against the holding die, then this centering die is slid out of line of the work as the finishing die is moved into line, and the next blow of the I )section of a four prong rivet.

hammer upsets therewith the rivet head in proper shape and the rivet is thereafter ejected.

In my improved machine, the holding die 2, is adapted as shown at 2', Fig. 1, to form the body of the rivet as it is forced therein when a head is formed by the centering die 7, and the bod of the rivet may be lengthened more or ess by adjusting the position of the ejector 3, at this point.

The point of the ejector is adapted as shown at 3, Fig. 1 to pierce and vextrude the body of the rivet when pressed thereinto while it is in an enlarged section of the die 2 as shown at 2, Fig. 3.

The operation of the machine is as follows, after a rivet-blank is cut and fed to the holding die 2, it is struck by the heading dies thus forcing rivet-blank thereinto and reducing the body of the rivet as shown at 2, Fig. '1, after the head of the rivet is finished and while the heading die 8 with i the carrier 6, and hammer 5 are receding, and while the reduced portion of the rivet body is located within the holding die, the ejector 3, with the rivet is advanced enough more than the heading die 8 recedes to force the ejector 3, into the reduced end of the rivet body thus iercin it and extruding the metal to fill t e hohfing die 2, as shown at 2, Fig. 3. Thereafter, the heading die 8 continues to recede and the ejector 3, pushes the finished rivet from the holding die 2, as shown in Fig. 4 the stripper 9 is 65 then moved under the rivet head as shown,

I claim is:

and the ejector 3 is then withdrawn thus com letin the cycle of operations.

I ave escribed these embodiments of my invention as a plied to solid and nonseparable dies ut s lit or separable (lies may be used where it is desirable, as for instance in themaking of long rivets, without departing from the spirit of the invention and I do not limit myself solely to such applications as are herein shown for it is intended that all matter herein contained shall be interpreted as illustrative and not in a limitin sense.

Having t us described my invention what 1. The herein described method of manufacturing rivets which consists in initially forming the portion thereof to be extruded of reduced cross sectional area with relation to the body of the rivet and subs uently extrudin said portion substantia 3'. as describe 2. The herein described method of manufacturing rivets which consists in initially forming the portion thereof to be extruded of reduced cross sectional area with relation to the body of the rivet and subsequently extruding said portion substantially as described while supporting the body of the rivet in alinement with extrudin means.

3. Inarivet makin machine, dies adapted to head a rivet-blank and to form a body provided with a portion of relatively reduced cross sectional area and means for piercing after the head and bod are formed the sai reduced cross sectiona area longitudinally with the body of the rivet and therewith extrudin radially metal from the center ofthe rivet dy.

4. Inarivet making machine, dies ada ted to receive and head a rivet blank, an to form a body having a portion of a relatively reduced cross sectional area means for piercing longitudinally the reduced portion of the rivet body after it is headed and means for stripping the rivet from the piercing means su tantially as described.

5. In a machine of the character described, headin dies, a rivet blank receiving die adapte to form a rivet bod having a portion of a relatively reduce cross sectional area, and an ejector arra ed in concentric alinement with the blan receiving die adapted and arranged to ierce a rivet body after it is headed, and a apted for adjustment for the purpose of regulating the leongth of the reduced portion of the rivet b y substantially as described.

6. In a machine of the character described, a rivet blank receiving die ada ted to form a rivet body having a portion 0 a relatively reduced cross sectional area, and means adapted for positioning, dividing, and ex- 1331 ing the reduced portion of the rivet 7. Inarivet making machine, dies adapted While it is positioned free of its forming to form a rivet having a body provided with Walls. lt

a portion of a relatively reduced cross sec- In Witness whereof, I have signed my tional area, and a punch arranged and adaptname to the foregoing.

5 ed initially, to indent centrally the said re- Dated April 29th, 1920.

duced ortion of the rivet body when it is HENRY C. HINCHCLIFF. formed and operable to pierce and extrude Witness: the said reduced portion of the rivet body C. L. BAOKER. 

